Bitcoin DeFi is a new trend that has been emerging lately and could be a form of “bitcoin investing”.
One important thing about Bitcoin DeFi is that there are solutions on the Bitcoin blockchain - like Ordinals - which I personally think is a bad idea. But there are already solutions that have used Bitcoin wrap solutions to create DeFi with assets backed by the price of Bitcoin. Some ETFs are already saying that they think Bitcoin DeFi will be a $1 trillion market. Now, the solutions have $1 billion. So... it's a long way to go and right now they are all hyper-experimental solutions. But maybe in the future.